South Dakota Highway 258
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| Route information | |
| Defined by SDCL §31-4-224 | |
| Maintained by SDDOT | |
| Length: | 2.552 mi (4.107 km) |
| Major junctions | |
| West end: |
 I-90 south of Plankinton
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| East end: |
 US 281 east of Plankinton |
| Location | |
| Counties: | Aurora |
| Highway system | |
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South Dakota Highway 258 (SD 258) is a 2.552-mile-long (4.107 km) state highway in Aurora County, South Dakota. It runs from Interstate 90 (I-90) to U.S. Route 281 (US 281), and is maintained by the South Dakota Department of Transportation (SDDOT). The route is not a part of the National Highway System.
SD 258 begins at a diamond interchange with exit 308 of I-90 and travels north. The route enters the city of Plankinton almost immediately and continues north. The highway turns east onto Davenport Street in Plankinton and a curve takes the highway to the northeast. After leaving Plankinton, the road curves back to the east and continues through open plains for about one mile (1.6 km) before reaching its eastern terminus at an intersection with US 281. The roadway continues east of this intersection as County Road 34.
SD 258 is maintained by SDDOT. In 2012, the traffic on the road was measured in average annual daily traffic. SD 258 was measured at 900 vehicles. The highway is not a part of the National Highway System, a system of highways important to the nation's defense, economy, and mobility.
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